US10851678B2 - Thermal energy recovery device and startup operation method for the same - Google Patents
Thermal energy recovery device and startup operation method for the same Download PDFInfo
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- US10851678B2 US10851678B2 US16/464,696 US201716464696A US10851678B2 US 10851678 B2 US10851678 B2 US 10851678B2 US 201716464696 A US201716464696 A US 201716464696A US 10851678 B2 US10851678 B2 US 10851678B2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
- F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
- F01D17/145—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path by means of valves, e.g. for steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
- F22B35/001—Controlling by flue gas dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
Definitions
- the present invention relates to a thermal energy recovery device and a startup operation method for the same.
- patent literature 1 discloses a power generation device (thermal energy recovery device) with an evaporator, a preheater, an expander, a power generator, a condenser, a working fluid pump and a circulation flow path.
- the evaporator heats a working fluid with a heating medium supplied from an external heat source.
- the preheater heats the working fluid before flowing into the evaporator with the heating medium flowing out from the evaporator.
- the expander expands the working fluid flowing out from the evaporator.
- the power generator is connected to the expander.
- the condenser condenses the working fluid flowing out from the expander.
- the working fluid pump feeds the working fluid condensed in the condenser to the preheater.
- the circulation flow path connects the preheater, the evaporator, the expander, the condenser and the pump.
- the temperature of the evaporator suddenly increases at the time of starting the operation of this recovery device, whereby a thermal stress generated in the evaporator may suddenly increase.
- the temperature of the evaporator is relatively low, whereas thermal energy of the heating medium such as steam is very large.
- the high-temperature heating medium flows into the evaporator at the time of starting the operation, the temperature of the evaporator may suddenly increase.
- Patent Literature 1 Japanese Unexamined Patent Publication No. 2014-47632
- An object of the present invention is to provide a thermal energy recovery device capable of suppressing a sudden increase of a thermal stress generated in an evaporator at the time of starting an operation and a startup operation method for the same.
- a thermal energy recovery device includes a working fluid circulation flow path for circulating a working fluid, a thermal fluid circulation flow path for circulating a pressurized heating fluid in a liquid state, an evaporation unit for evaporating the working fluid flowing in the working fluid circulation flow path by heat of the heating fluid flowing in the thermal fluid circulation flow path, and a control unit for controlling a startup operation of the thermal energy recovery device.
- the control unit executes a suppression control for suppressing a temperature difference between the heating fluid and the working fluid in the evaporation unit in the startup operation.
- a startup operation method for thermal energy recovery device is a startup operation method for thermal recovery device with an evaporation unit for evaporating a working fluid flowing in a working fluid circulation flow path by heat of a heating fluid flowing in a thermal fluid circulation flow path, wherein a suppression control for suppressing a temperature of the working fluid in the evaporation unit is executed in a startup operation of the thermal energy recovery device.
- FIG. 1 is a diagram showing a schematic configuration of a thermal energy recovery device according to a first embodiment of the present invention
- FIG. 2 is a graph showing temperature transitions of a working fluid and hot water in the thermal energy recovery device
- FIG. 3 is a chart showing a control operation of a startup operation of the thermal energy recovery device
- FIG. 4 is a chart showing a control operation of a stop operation of the thermal energy recovery device
- FIG. 5 is a diagram showing a schematic configuration of a thermal energy recovery device according to a modification of the first embodiment of the present invention
- FIG. 6 is a diagram showing a schematic configuration of a thermal energy recovery device according to a second embodiment of the present invention.
- FIG. 7 is a graph showing temperature transitions of a working fluid and hot water in the thermal energy recovery device
- FIG. 8 is a chart showing a control operation of a normal operation of the thermal energy recovery device
- FIG. 9 is a diagram showing a schematic configuration of a thermal energy recovery device as a reference example.
- FIG. 10 is a graph showing temperature transitions of a working fluid and hot water in the reference example.
- thermal energy recovery device according to a first embodiment of the present invention is described with reference to the drawings.
- the thermal energy recovery device 1 includes a working fluid circulation flow path for circulating a working fluid while being accompanied by a phase change (hereinafter, merely referred to as a “circulation flow path”) 22 , a thermal fluid circulation flow path 30 for circulating hot water serving as a pressurized heating fluid in a liquid state, and a control unit 50 .
- a heater 32 is provided in the thermal fluid circulation flow path 30 .
- This heater 32 includes a heating medium flow path 32 a in which a heating medium (high-temperature gas such as corrosive gas) in a gas phase flows and a thermal fluid flow path 32 b in which hot water flows.
- the heating medium in the heating medium flow path 32 a and the hot water in the thermal fluid flow path 32 b exchange heat in the heater 32 . In this way, the hot water is heated.
- the thermal energy recovery device 1 recovers thermal energy of the heating medium. In the recovery device 1 , this thermal energy of the heating medium is temporarily recovered in the hot water of the thermal fluid circulation flow path 30 .
- the thermal fluid circulation flow path 30 is interposed between a pipe 34 in which the heating medium flows and the circulation flow path 22 in which the working fluid is circulated, the heating medium does not flow into later-described evaporator 10 and preheater 12 provided in the circulation flow path 22 . Thus, even if the heating medium is corrosive gas, the corrosion of the evaporator 10 and the preheater 12 can be prevented.
- the heating medium flow path 32 a is connected to a heating pipe 35 branched from the pipe 34 in which the heating medium flows.
- a flow rate of the heating medium flowing into the heater 32 can be adjusted by changing an opening of a flow rate control value Va 1 provided in the heating pipe 35 .
- the flow rate control valve Va 1 may be arranged upstream of the heater 32 in the heating pipe 35 or may be arranged downstream of the heater 32 .
- the evaporator 10 , the preheater 12 , an energy recovery unit 13 , a condenser 18 and a pump 20 are provided in the circulation flow path 22 .
- the evaporator 10 includes a first flow path 10 a in which the working fluid flows and a second flow path 10 b in which the hot water flows.
- the evaporator 10 performs heat exchange between the hot water in the thermal fluid circulation flow path 30 and the working fluid (HFC245fa or the like) in the circulation flow path 22 . In this way, the working fluid evaporates.
- a brazing plate type heat exchanger is used as the evaporator 10 .
- a so-called shell-and-tube type heat exchanger may be used as the evaporator 10 .
- the preheater 12 is arranged between the evaporator 10 and the pump 20 in the circulation flow path 22 .
- the preheater 12 includes a first flow path 12 a in which the working fluid flows and a second flow path 12 b in which the hot water flows.
- the preheater 12 performs heat exchange between the hot water flowing out from the evaporator 10 and the working fluid before flowing into the evaporator 10 . In this way, the working fluid is heated.
- a brazing plate type heat exchanger is used also as the preheater 12 .
- a so-called shell-and-tube heat exchanger may be used as the preheater 12 as in the case of the evaporator 10 .
- an evaporation unit for evaporating the working fluid includes the evaporator 10 and the preheater 12 provided separately from the evaporator 10 .
- the evaporator 10 functioning as the evaporation unit may be provided, whereas the preheater may be omitted.
- the energy recovery unit 13 includes an expander 14 and a power recovery device 16 .
- the expander 14 is provided in a part of the circulation flow path 22 downstream of the evaporator 10 .
- the preheater 12 , the evaporator 10 , the expander 14 , the condenser 18 and the pump 20 are connected to the circulation flow path 22 in this order.
- the expander 14 expands the working fluid in a gas phase flowing out from the evaporator 10 .
- a positive displacement screw expander including a rotor to be rotationally driven by expansion energy of the working fluid in a gas phase flowing out from the evaporator 10 is used as the expander 14 .
- the expander 14 includes a pair of male and female screw rotors.
- the power recovery device 16 is connected to the expander 14 .
- a power generator is used as the power recovery device 16 .
- This power recovery device 16 includes a rotary shaft connected to one of the pair of screw rotors of the expander 14 .
- the power recovery device 16 generates power as the rotary shaft rotates according to the rotation of the screw rotor.
- a compressor or the like may be used as the power recovery device 16 .
- An isolation valve V- 1 is provided in a part of the circulation flow path 22 between the evaporator 10 and the expander 14 . Further, a bypass flow path 24 bypassing the isolation valve V- 1 and the expander 14 is provided in the circulation flow path 22 . An on-off valve V- 2 is provided in the bypass flow path 24 .
- the condenser 18 is provided in a part of the circulation flow path 22 downstream of the expander 14 .
- the condenser 18 condenses (liquefies) the working fluid flowing out from the expander 14 by cooling the working fluid with a cooling medium (cooling water or the like) supplied from outside.
- the cooling medium is supplied through a cooling medium flow path 37 , for example, from a cooling tower connected to the cooling medium flow path 37 .
- the pump 20 is provided in a part of the circulation flow path 22 downstream of the condenser 18 (part between the condenser 18 and the preheater 12 ).
- the pump 20 pressurizes the working fluid in a liquid phase to a predetermined pressure and feeds the pressurized working fluid to the preheater 12 .
- a centrifugal pump including an impeller as a rotor, a gear pump including a rotor composed of a pair of gears, a screw pump, a trochoid pump or the like is used as the pump 20 .
- the heating fluid is sealed in a pressurized state in the thermal fluid circulation flow path 30 .
- the hot water is sealed in a pressurized state in the thermal fluid circulation flow path 30 .
- the evaporator 10 , the preheater 12 , a buffer tank 38 , a fluid pump 40 and the heater 32 are arranged in this order in the thermal fluid circulation flow path 30 .
- the hot water successively flows through the evaporator 10 , the preheater 12 , the buffer tank 38 , the fluid pump 40 and the heater 32 .
- the buffer tank 38 is provided on a suction side of the fluid pump 40 . By providing the buffer tank 38 , a predetermined pressure (head pressure) can be applied to the suction side of the fluid pump 40 .
- the thermal energy recovery device 1 is provided with an inlet-side working fluid temperature sensor Tr 1 , an outlet-side working fluid temperature sensor Tr 2 , an inlet-side hot water temperature sensor Tw 1 and an outlet-side hot water temperature sensor Tw 2 .
- the inlet-side working fluid temperature sensor Tr 1 detects a temperature of the working fluid on an inlet side of the evaporation unit, i.e. the preheater 12 and outputs a signal indicative of a detection value.
- the outlet-side working fluid temperature sensor Tr 2 detects a temperature of the working fluid on an outlet side of the evaporation unit, i.e. the evaporator 10 and outputs a signal indicative of a detection value.
- the inlet-side hot water temperature sensor Tw 1 detects a temperature of the hot water on an inlet side of the evaporation unit, i.e. the evaporator 10 and outputs a signal indicative of a detection value.
- the outlet-side hot water temperature sensor Tw 2 detects a temperature of the hot water on an outlet side of the evaporation unit, i.e. the preheater 12 and outputs a signal indicative of a detection value.
- the signals output from these sensors Tr 1 , Tr 2 , Tw 1 and Tw 2 are input to the control unit 50 .
- the control unit 50 executes a suppression control for suppressing a temperature difference between the hot water and the working fluid in the evaporator 10 and the preheater 12 during a startup operation of the thermal energy recovery device 1 .
- the temperature of the working fluid increases from a temperature tr 1 on the inlet side of the preheater 12 to a temperature tr 3 by being heated by the hot water in the preheater 12 and the evaporator 10 .
- the working fluid evaporated in the evaporator 10 is further heated in the evaporator 10 to reach a temperature tr 2 .
- the temperature of the hot water gradually decreases from a temperature tw 1 on the inlet side of the evaporator 10 and reaches a temperature tw 2 on the outlet side of the preheater 12 . Since the working fluid undergoes a phase change in the evaporator 10 , a temperature change amount is small. In contrast, a temperature change amount of the working fluid is large in the preheater 12 . Thus, a temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side of the preheater 12 and the temperature tr 1 of the working fluid on the inlet side of the preheater 12 increases. Particularly, since the temperature of the working fluid is low in some cases during the startup operation, the temperature difference ⁇ t tends to increase and a thermal stress generated in the preheater 12 possibly becomes problematic.
- control unit 50 executes the suppression control for suppressing the temperature difference between the hot water and the working fluid in the evaporator 10 and the preheater 12 during the startup operation.
- Step ST 1 an operator first confirms that the flow rate control valve Va 1 is closed, the isolation valve V- 1 is closed and the on-off valve V- 2 in the bypass flow path 24 is open (Step ST 1 ). Then, the operator operates an unillustrated start button. In this way, the pump 20 and the fluid pump 40 start operating (Step ST 2 ). Further, the operation of the cooling tower is started, whereby the cooling medium is supplied to the condenser 18 through the cooling medium flow path 37 (Step ST 3 ).
- the control unit 50 controls to slightly open the flow rate control valve Va 1 (Step ST 4 ). At this time, the opening is set at a value set in advance such as ⁇ %.
- the control unit 50 controls to gradually increase the opening of the flow rate control valve Va 1 (Step ST 5 ). In this way, the temperature of the hot water gradually increases. At this time, the temperature tw 1 of the hot water on the inlet side of the evaporator 10 is monitored by the inlet-side hot water temperature sensor Tw 1 .
- the control unit 50 gradually increases the opening of the flow rate control valve Va 1 until the temperature reaches an operation start temperature (e.g. 90° C.) set in advance. However, the operation start temperature is not limited to 90° C.
- Step ST 6 the control unit 50 opens the isolation valve V- 1 and closes the on-off valve V- 2 in the bypass flow path 24 .
- the expander 14 is driven to start power recovery by the power recovery device 16 (Step ST 6 ).
- Step ST 7 it is confirmed whether or not the operation (power generation) has been continuously stably performed for a given time.
- the control unit 50 controls to gradually increases the opening of the flow rate control valve Va 1 with the temperatures monitored by the respective temperature sensors Tr 1 , Tr 2 , Tw 1 and Tw 2 (Step ST 8 ).
- a rate of increasing the opening of the flow rate control valve Va 1 is so set that a temperature increase rate ⁇ T (C°/min) of the temperature tw 1 of the hot water on the inlet side of the evaporator 10 is larger than a temperature increase rate when the temperature is below the operation start temperature.
- Step ST 8 the temperature tw 1 of the hot water on the inlet side of the evaporator 10 is monitored and, if the temperature tw 1 of the hot water is below a temperature set in advance, the control unit 50 gradually increases the opening of the flow rate control valve Va 1 as described above. If the temperature tw 1 of the hot water is equal to or higher than the temperature set in advance, the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side of the preheater 12 and the temperature tr 1 of the working fluid on the inlet side of the preheater 12 is also monitored.
- the control unit 50 executes the suppression control to gradually increase the opening of the flow rate control valve Va 1 in such a range where the temperature difference ⁇ t does not exceed a value set in advance.
- the temperature tw 1 of the hot water on the inlet side of the evaporator 10 gradually increases and the temperature tw 2 of the hot water on the outlet side of the preheater 12 also gradually increases.
- the temperature difference ⁇ t between the temperature tw 2 and the temperature tr 1 is suppressed to be equal to or lower than a predetermined temperature and does not become excessive. Specifically, an input heat quantity increase rate from the hot water in the evaporator 10 and the preheater 12 is suppressed.
- a rotation speed of the fluid pump 40 may also be adjusted in association with an opening adjustment of the flow rate control valve Va 1 . Specifically, the rotation speed of the fluid pump 40 may be adjusted to further finely adjust the temperature by the flow rate control valve Va 1 .
- the control unit 50 judges whether or not the temperature tw 1 of the hot water on the inlet side of the evaporator 10 has reached an operating temperature (e.g. 130° C.) set in advance (Step ST 9 ) and the startup operation transitions to a normal operation by an automatic operation when the temperature tw 1 reaches the operating temperature (Step ST 10 ).
- an operating temperature e.g. 130° C.
- the temperature tw 1 of the hot water on the inlet side of the evaporator 10 is, for example, about 130° C.
- the temperature of the hot water on the outlet side of the evaporator 10 is, for example, about 115° C.
- the temperature tw 2 of the hot water on the outlet side of the preheater 12 is, for example, about 100° C.
- the temperature of the working fluid on the inlet side of the preheater 12 is, for example, about 20° C. at the start of the operation, but reaches, for example, about 40° C. during the normal operation.
- the temperature of the working fluid on the outlet side of the evaporator 10 is, for example, about 120° C.
- FIG. 4 shows a stop flow during the automatic operation.
- the control unit 50 closes the isolation valve V- 1 and opens the on-off valve V- 2 in the bypass flow path 24 (Step ST 22 ). In this way, the working fluid bypasses the expander 14 , wherefore power generation is stopped. Then, the flow rate control valve Va 1 is closed (Step ST 23 ). Since the temperature of the hot water circulating in the thermal fluid circulation flow path 30 decreases in this way, the input heat quantities to the evaporator 10 and the preheater 12 decrease. Then, the pump 20 and a hot water pump are stopped (Step ST 24 ). At this time, the operation of the cooling tower is maintained (Step ST 25 ).
- heat exchange is performed between the hot water introduced from the thermal fluid circulation flow path 30 and the working fluid introduced from the circulation flow path 22 in the evaporator 10 and the preheater 12 . Since the pressurized hot water in a liquid state flows into the evaporator 10 and the preheater 12 , thermal energy introduced to the evaporator 10 and the preheater 12 is large. Thus, in the startup operation in which the temperature of the working fluid is relatively low, the suppression control is executed to suppress the temperature difference between the hot water and the working fluid in the evaporator 10 and the preheater 12 . Therefore, it can be suppressed that large thermal stresses are generated in the evaporator 10 and the preheater 12 during the startup operation.
- the input heat quantities in the evaporator 10 and the preheater 12 are suppressed such that the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side of the preheater 12 and the temperature tr 1 of the working fluid on the inlet side of the preheater 12 is equal to or lower than the predetermined temperature.
- the thermal stresses in the evaporator 10 and the preheater 12 become excessive at the start of the operation.
- the temperature difference between the temperature tw 2 of the hot water on the outlet side and the temperature tr 1 of the working fluid on the inlet side is largest in the preheater 12 .
- the suppression control on the basis of this temperature difference between the both, it can be reliably suppressed that the terminal stress in the preheater 12 becomes excessive.
- control unit 50 adjusts the opening of the flow rate control valve Va 1 in the startup operation, whereby the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side and the temperature tr 1 of the working fluid on the inlet side is maintained to be equal to or lower than the predetermined temperature.
- the control unit 50 adjusts the opening of the flow rate control valve Va 1 in the startup operation, whereby the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side and the temperature tr 1 of the working fluid on the inlet side is maintained to be equal to or lower than the predetermined temperature.
- the suppression control is executed to control the temperature difference ⁇ t between the hot water and the working fluid in the startup operation.
- FIG. 6 shows a second embodiment of the present invention. Note that the same constituent elements as in the first embodiment are denoted by the same reference signs and the detailed description thereof is omitted here.
- a cooler 53 is provided in a thermal fluid circulation flow path 30 and a temperature difference ⁇ t between a temperature tw 2 of hot water on an outlet side of a preheater 12 and a temperature tr 1 of a working fluid on an inlet side of the preheater 12 is reduced by operating the cooler 53 .
- the cooler 53 is for reducing the temperature of the hot water through heat exchange between a cooling medium (air, water or the like) and the hot water. If air is used as the cooling medium, a fan 54 for generating an air flow is provided. By driving the fan 54 , the cooler 53 operates. In this way, the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side of the preheater 12 and the temperature tr 1 of the working fluid on the inlet side is controlled to or below a predetermined temperature. Note that if water is used as the cooling medium, an unillustrated pump is provided and the cooler 53 operates by driving the pump.
- a cooling medium air, water or the like
- a temperature tw 4 of the hot water on an inlet side of the preheater 12 becomes lower than a temperature tw 3 of the hot water on an outlet side of the evaporator 10 as shown in FIG. 7 by operating the cooler 53 .
- the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side of the preheater 12 and the temperature tr 1 of the working fluid on the inlet side of the preheater 12 is suppressed to be equal to or lower than the predetermined temperature.
- the temperature of the hot water exhibits a temperature transition shown in FIG. 2 in a state where the cooler 53 is not operated.
- Step ST 31 whether or not the temperature difference ⁇ t between the temperature tw 2 of the hot water on the outlet side of the preheater 12 and the temperature tr 1 of the working fluid on the inlet side of the preheater 12 is equal to or lower than the temperature set in advance during the normal operation is monitored by the control unit 50 (Step ST 31 ) as shown in FIG. 8 . If the temperature difference ⁇ t is judged to have exceeded the temperature set in advance, the control unit 50 operates the cooler 53 (Step ST 32 ).
- the control unit 50 stops the cooler 53 (Step ST 54 ).
- the control unit 50 operates the cooler 53 if the temperature difference ⁇ t between the hot water and the working fluid exceeds the predetermined temperature. In this way, the temperature of the hot water flowing in the thermal fluid circulation flow path 30 decreases. Thus, the temperature difference ⁇ t between the hot water and the working fluid in the preheater 12 can be reduced.
- a regenerator 58 is provided between a pump 20 and the preheater 12 in a circulation flow path 22 .
- This regenerator 58 heats the working fluid flowing from the pump 20 toward the preheater 12 by the working fluid discharged from an expander 14 and flowing toward a condenser 18 .
- the temperature difference ⁇ t in the preheater 12 can be reduced by increasing the temperature of the working fluid before flowing into the preheater 12 .
- a thermal energy recovery device of the above embodiment includes a working fluid circulation flow path for circulating a working fluid, a thermal fluid circulation flow path for circulating a pressurized heating fluid in a liquid state, an evaporation unit for evaporating the working fluid flowing in the working fluid circulation flow path by heat of the heating fluid flowing in the thermal fluid circulation flow path, and a control unit for controlling a startup operation of the thermal energy recovery device.
- the control unit executes a suppression control for suppressing a temperature difference between the heating fluid and the working fluid in the evaporation unit in the startup operation.
- the pressurized heating fluid in a liquid state flows into the evaporation unit, thermal energy introduced to the evaporation unit is large.
- heat exchange is performed between the heating fluid in a liquid state introduced from the thermal fluid circulation flow path and the working fluid introduced from the working fluid circulation flow path.
- the suppression control is executed to suppress the temperature difference between the heating fluid and the working fluid in the evaporation unit. Therefore, it can be suppressed that a large thermal stress is generated in the evaporation unit during the startup operation.
- the suppression control may be a control for setting a temperature difference between the heating fluid flowing out from the evaporation unit and the working fluid flowing into the evaporation unit equal to or lower than a predetermined temperature set in advance when the temperature of the heating fluid flowing into the evaporation unit is equal to or higher than a temperature set in advance.
- an input heat quantity in the evaporation unit is so suppressed that a temperature difference between the temperature of the heating fluid on an outlet side of the evaporation unit and the temperature of the working fluid on an inlet side of the evaporation unit becomes equal to or lower than the predetermined temperature when the temperature of the heating fluid is equal to or higher than the predetermined temperature set in advance.
- the thermal stress in the evaporation unit becomes excessive during the startup operation.
- the temperature difference between the temperature of the heating fluid on the outlet side and the temperature of the working fluid on the inlet side is largest in the evaporation unit.
- the above thermal energy recovery device may include a heater provided in the thermal fluid circulation flow path for heating the heating fluid with heat of a heating medium in a gas state and a flow rate control valve for adjusting a flow rate of the heating medium introduced into the heater.
- the control unit may adjust an opening of the flow rate control valve such that the temperature difference between the heating fluid flowing out from the evaporation unit and the working fluid flowing into the evaporation unit is maintained to be equal to or lower than the predetermined temperature in the startup operation.
- the temperature difference is maintained to be equal to or lower than the predetermined temperature by the control unit adjusting the opening of the flow rate control valve in the startup operation.
- the control unit adjusting the opening of the flow rate control valve in the startup operation.
- the above thermal energy recovery device may include a cooler for cooling the heating fluid flowing in the thermal fluid circulation flow path with a cooling medium.
- the control unit may operate the cooler to suppress the temperature difference between the heating fluid and the working fluid in the evaporation unit.
- control unit operates the cooler, for example, when the temperature difference between the heating fluid and the working fluid in the evaporation unit exceeds the predetermined temperature. In this way, the temperature of the heating fluid flowing in the thermal fluid circulation flow path decreases. Thus, the temperature difference between the heating fluid and the working fluid in the evaporation unit can be reduced.
- the evaporation unit may include an evaporator for evaporating the working fluid by the heat of the heating fluid flowing in the thermal fluid circulation flow path and a preheater for heating the working fluid before flowing into the evaporator by the heat of the heating fluid flowing in the thermal fluid circulation flow path.
- thermal energy introduced to the preheater may increase, but the suppression control for suppressing the temperature difference between the heating fluid and the working fluid is executed in the startup operation.
- the suppression control for suppressing the temperature difference between the heating fluid and the working fluid is executed in the startup operation.
- a startup operation method for thermal energy recovery device of the above embodiment is a startup operation method for thermal energy recovery device with an evaporation unit for evaporating working fluid flowing in a working fluid circulation flow path by heat of a heating fluid flowing in a thermal fluid circulation flow path, wherein a suppression control for suppressing a temperature of the working fluid in the evaporation unit is executed in a startup operation of the thermal energy recovery device.
- a heater for heating the heating fluid by heat of a heating medium in a gas state may be provided in the thermal fluid circulation flow path.
- an opening of a flow rate control valve for adjusting a flow rate of the heating medium introduced into the heater may be adjusted such that a temperature difference between the heating fluid flowing out from the evaporation unit and the working fluid flowing into the evaporation unit is maintained to be equal to or lower than the predetermined temperature.
- a cooler for cooling the heating fluid flowing in the thermal fluid circulation flow path by a cooling medium may be provided.
- the above startup operation method for thermal energy recovery device may include operating the cooler to suppress the temperature difference between the heating fluid and the working fluid in the evaporation unit if the temperature difference between the heating fluid flowing out from the evaporation unit and the working fluid flowing into the evaporation unit exceeds a temperature set in advance.
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- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
Description
Claims (4)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2016-234901 | 2016-12-02 | ||
JP2016234901A JP6718802B2 (en) | 2016-12-02 | 2016-12-02 | Thermal energy recovery device and start-up operation method thereof |
PCT/JP2017/041132 WO2018101043A1 (en) | 2016-12-02 | 2017-11-15 | Thermal energy recovery device and startup operation method for same |
Publications (2)
Publication Number | Publication Date |
---|---|
US20190383177A1 US20190383177A1 (en) | 2019-12-19 |
US10851678B2 true US10851678B2 (en) | 2020-12-01 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US16/464,696 Active US10851678B2 (en) | 2016-12-02 | 2017-11-15 | Thermal energy recovery device and startup operation method for the same |
Country Status (6)
Country | Link |
---|---|
US (1) | US10851678B2 (en) |
EP (1) | EP3536915A4 (en) |
JP (1) | JP6718802B2 (en) |
KR (1) | KR20190086534A (en) |
CN (1) | CN109996935A (en) |
WO (1) | WO2018101043A1 (en) |
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JPS5865917A (en) | 1981-10-15 | 1983-04-19 | Takuma Sogo Kenkyusho:Kk | Power generating device of exhaust heat recovery in diesel engine |
JPS58104401A (en) | 1981-12-17 | 1983-06-21 | 株式会社東芝 | Method and device for controlling quantity of ventilation of steam generator |
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JP6194274B2 (en) * | 2014-04-04 | 2017-09-06 | 株式会社神戸製鋼所 | Waste heat recovery system and waste heat recovery method |
-
2016
- 2016-12-02 JP JP2016234901A patent/JP6718802B2/en not_active Expired - Fee Related
-
2017
- 2017-11-15 KR KR1020197018208A patent/KR20190086534A/en active IP Right Grant
- 2017-11-15 US US16/464,696 patent/US10851678B2/en active Active
- 2017-11-15 WO PCT/JP2017/041132 patent/WO2018101043A1/en unknown
- 2017-11-15 EP EP17875253.1A patent/EP3536915A4/en not_active Withdrawn
- 2017-11-15 CN CN201780073212.4A patent/CN109996935A/en active Pending
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JPS5799223A (en) | 1980-12-10 | 1982-06-19 | Chiyoda Chem Eng & Constr Co Ltd | Power collector device from lng by rankin cycle and its start-up method |
JPS5865917A (en) | 1981-10-15 | 1983-04-19 | Takuma Sogo Kenkyusho:Kk | Power generating device of exhaust heat recovery in diesel engine |
JPS58104401A (en) | 1981-12-17 | 1983-06-21 | 株式会社東芝 | Method and device for controlling quantity of ventilation of steam generator |
JPS6296704A (en) | 1985-10-23 | 1987-05-06 | Toshiba Corp | Hot water turbine plant |
JPH01237309A (en) | 1988-03-16 | 1989-09-21 | Hitachi Ltd | Generating equipment using lng cryogenic heat |
US20120285167A1 (en) * | 2006-11-15 | 2012-11-15 | Jon Horek | Heat recovery system and method |
US20170284230A1 (en) * | 2007-03-02 | 2017-10-05 | Victor Juchymenko | Controlled organic rankine cycle system for recovery and conversion of thermal energy |
US20130047614A1 (en) | 2010-05-13 | 2013-02-28 | Turboden S.R.L. | High temperature orc system |
US20120031096A1 (en) | 2010-08-09 | 2012-02-09 | Uop Llc | Low Grade Heat Recovery from Process Streams for Power Generation |
US20160047540A1 (en) | 2010-11-17 | 2016-02-18 | Technische Universitaet Muenchen | Method and Apparatus For Evaporating Organic Working Media |
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JP2014047632A (en) | 2012-08-29 | 2014-03-17 | Kobe Steel Ltd | Power generation device and method of controlling power generation device |
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US20190226364A1 (en) * | 2016-06-27 | 2019-07-25 | Fives Stein | Method and facility for recovering thermal energy on a furnace with tubular side members and for converting same into electricity by means of a turbine producing the electricity by implementing a rankine cycle |
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Also Published As
Publication number | Publication date |
---|---|
KR20190086534A (en) | 2019-07-22 |
EP3536915A4 (en) | 2020-06-24 |
JP6718802B2 (en) | 2020-07-08 |
US20190383177A1 (en) | 2019-12-19 |
EP3536915A1 (en) | 2019-09-11 |
CN109996935A (en) | 2019-07-09 |
WO2018101043A1 (en) | 2018-06-07 |
JP2018091216A (en) | 2018-06-14 |
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